On Shabbos can we use the diapers that have a special line outside the diaper that changes color from blue to yellow when the child relieves itself?

  Yes.   Sources: יל״ע מצד הגדול, אם הלבשת התינוק … Continue reading On Shabbos can we use the diapers that have a special line outside the diaper that changes color from blue to yellow when the child relieves itself?